@misc{indiciaef835e3f3c74c,
  title = {Surficial geologic map along Route 110 relocation from Lowell to Littleton, Massachusetts},
  author = {Joseph H. Hartshorn and P.M. Hanshaw},
  year = {1956},
  doi = {10.3133/ofr5651},
  url = {https://pubs.usgs.gov/publication/ofr5651},
  note = {Source identifier: ofr5651}
}